Improvement in power-hammers



3 She ets-Sheet1.

1. M. L0Nfi.

Power Hammers.

Pate 'nted Feb. 25,1873

AM. PHOTO-. I THOGIMP/IIC C0. N. (USBORNEJS' PROCESS.)

J. M'. LUNG. Power Hammers.

No. 136,253. Patented Feb-25,1873.

AM FHUTO 1mm GRAPHIC ca 1v. m'usa aR/vEls mocgss) asheets s ee af UNITED STATES PATENT OFFICE.

' JOHN M. LONG, OF HAMILTON, OHIO, ASSIGNOR TO LONG AND ALLSTATTER,

OF SAME PLACE.

IMPROVEMENT IN POWER-HAMMERSQ Specification forming part of Letters Patent No. 136,253, dated February 25, 1873.

To all whom it may concern:

Be it known that 1, JOHN M. LONG, of Hamilton, Butler county, State of Ohio, have invented certain new and useful Improvements in Power-Hammers, of which the followingis a specification:

Nature and Objects of the I noentton.

. point where the blow is struck with every thickness of work submitted to it 5 second, in a pcculiar construction of yoke and springs, by which the hammer is firmly secured .in place and provided with the requisite degree of elasticity; third, in a certain combination of treadle, brake, and belt-tightener, by which any degree of tightness can be imparted to the driving-belt, and the machine stopped instantly when desired; fourth, in a peculiar device for giving a variable stroke to the hammer.

Description of the Accompanying Drawing.

Figure 1 is a perspective view of a powerhammer embodying my invention. Fig. 2 is an elevation of the combined treadle, brake, and belt-tightener. Fig. 3 is a perspective view of the adjustable eccentric for giving a variable stroke to the hammer. Fig. 4 is a cross-section of the eccentric. Fig. 5is an elevation of the adjustable slide, which carries the hammer and its driving mechanism. Fig. 6 is a cross-section of the yoke to which the hammer is secured. Fig. 7 is a cross-section of the sleeve in which the hammer-arm is fastened, with the yoke and journals upon which the sleeve and yoke vibrate.

General Description.

A is the main frame of a machine, comprising in its construction the housings B B and socket O, for the reception of the anvil-block D. The anvil-block is secured to the frame A by bolts E. The housings B B are dovetailed exteriorly and fitted with the sliding adj ustable frames F. The frames or slides F are formed with journal-bearings G G for the reception of the driving-shaft H of the machine, and journal-bearings I for the brake-shaft J, so that when the slides are moved the shafts H J move with them. To these frames or slides F the swinging hammer is also attached by the following parts: A sleeve, K, provided with trunnions k k, is pivoted to the slides F by means of the pointed set-screws a a. Upon the trunnions k k the yoke L is fitted to oscillate, the arms 1 of the yoke fitting loosely over the trunnions k k. The yoke L is provided with sockets M, into which the rubber springs N are fitted, and is also constructed with a jaw, O, to connect with the driving-cam of the machine. The wooden arm P of the hammer is fitted tightly to the sleeve K and secured by set-screws b and gibs c. It passes between the arms Z of the yoke L, its upper and lower sides being submitted to the pressure of the springs N. The degree of pressure exerted by the springs N can be regulated by the setscrew cl. To the end of the hammer-arm P the customary helve p is fitted, which plays in the usual way upon the anvil Q. The hammer is operated by the eccentric rod B, cam S, and driving-shaft H, the latter being forcibly rotated by a belt, T, upon pulley U. The slides or frames F are elevated and depressed simultaneously by screws V, bevel-gearing W, and hand-wheel shaft X, so that, no matter what the thickness of the work to be done, the hammer may be enabled to strike with the same force at all times, if desired, and the faces of the helve and anvil, when in contact with the work, may be parallel. The degree or extent of the stroke of the hammer may be varied by the following device: A head, 0, secured to the shaft H, has a groove, f, out across it, into which is fitted the tongue or projection g ofthe cam S, so that while the cam is permitted to slide for adjustment across the head, the lat ter may forcibly drive the cam. The cam S has an elongated aperture, 6, through which the shaft passes, and slots on for the screws n to pass through, which serve to secure the cam to the head 0 firmly after adjustment. The adjustmentof the cam is conveniently made by the screws 1", which pass through the cam S and press against the shaft H. By this adjustment of the cam any desired stroke may be given to the hammer, and by reason of the provision of the tongue and groove f 9 no strain is thrown upon the screws which adjust and secure the cam. The springs N afford the necessary elasticity for safely arresting the momentum of the hammer at each end of its stroke, so that the hammer may be driven at a high speed without throwing a damaging percussive force upon the driving mechanism. A treadle, Y, is pivoted at s to rod Z suspended from the frame F, and connects by rods Z to the brake t secured to the shaft J. At the opposite end of shaft J a weighted 1ever, t, is attached, which serves to put the pressure upon the brake when the treadle is lifted. The pressure of the foot upon the treadle serves to release the brake and to tighten the driving'belt at the same time by means of the rigid arm to attached to the brake t, and the roller U, over which the belt passes. By

the regulation of the pressure upon the treadle the friction of the belt may be so varied that the speed of the hammer may be changed at will, and when it is required to stop the hammer the release of the treadle causes the application of the brake to the rim of the pulley U.

Claims.

1. In combination with the stationary frame A B B, the vertically-adjustable frames or slides F, carrying the swinging hammer and its driving mechanism, substantially as and for the purpose specified.

2. The combination of sleeve K 70 7c, yoke L Z, springs N, and hammer-arm P connected to the frame A, and operating so as to permit the hammer to vibrate independent of the vibrating-yoke L, substantially as described.

3. The combination of pulley U, treadle Y, brake t, and belt-tightener w IJ, operating substantially as and for the purpose specified.

at. The combination of fixed head 0 having a groove, f, and slotted cam S 2' having a tongue, g, and being adjust-ably secured to the head 0, substantially as and for the purpose specified.

In testimony of which invention I hereunto set my hand.

Vitnesses: JOHN M. LONG.

FRANK MILLWARD, J. L. WARTMANN. 

